package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
//ServiceImpl<UserMapper, User> ServiceImpl是MybatisPlus提供的帮助我们实现单表增删改查
    //

    @Resource//注入Spring Redis api
    private StringRedisTemplate stringRedisTemplate;

    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }

        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.保存验证码到redis //set key value ex 120
        //加一个业务前缀以示区分
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.TODO 发送验证码
        log.info("发送短信验证码成功，验证码：{}",code);
        //返回ok
        return Result.ok();
    }


    /**
     * 登录功能
     * @param loginForm
     * @param session
     * @return
     */
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误！");
        }
        // 2.从redis获取校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.equals(code)){
            //3.不一致，报错
            return Result.fail("验证码错误");
        }
        //能走到这里就说明验证码通过了并且手机号正确

        //4.一致，根据手机号查询用户 select * from tb_user where phone = ?
        User user = query().eq("phone", phone).one();

        //5.判断用户是否存在
        if (user == null) {
            //6.不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }


        //7.保存用户信息到redis中
        //7.1.随机生成token,作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2.将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
            CopyOptions.create().setIgnoreNullValue(true).
                    setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString())
                );//id是Long 但是StringRedisTemplate要求必须是<String,String> //这样修改就全部转为字符串了
        //7.3.存储
        String tokenKey = LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //要设置一个有效期防止内存占用过多
        //7.4 设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
//        user.setNickName("user_" + RandomUtil.randomString(10));
        //但是最好就算定义为一个常量
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;


    }
}
